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The progress of the fourth expedition to the International Space Station will be discussed during a Mission Status Briefing beginning at 2 p.m. EST, Thursday, from NASA's Johnson Space Center in Houston. The news conference will air live on NASA Television.

Mission officials will offer an update on activities aboard the space station and upcoming events, including Friday's spacewalk by Commander Yury Onufrienko and Flight Engineer Dan Bursch.

Along with Flight Engineer Carl Walz, Onufrienko and Bursch are in the second month of a planned five-month stay aboard the orbiting complex.

NASA TV is available on GE-2, Transponder 9C at 85 degrees West longitude, vertical polarization, with a frequency of 3880 MHz, and audio of 6.8 MHz. For more information about the Expedition Four crew and the International Space Station, visit the web at: